99 Percentile Qs Bank for JEE MainChemistryp Block Elements (Group 13 & 14)
In which of the following reactions, hydrogen is liberated? (i) Al (s)+ HCl (a q) (ii) Al (s)+ NaOH (a q) (iii) NaBH ₄+ I ₂
Options
- Ai, ii
- Bii, iii
- Ci, iii
- Di, ii, iii
Correct answer
D. i, ii, iii
Step-by-step solution
(i) 2 Al (s)+6 HCl (a q) 2 AlCl ₃(a q)+3 H ₂ (ii) aligned 2 Al (s)+2 NaOH (a q) & & 2 Na [ Al ( OH )₄ ]+3 H ₂ & array l Sodium tetrahydroxo aluminate (III) array aligned (iii) aligned NaBH ₄+ I ₂ & BH ₃+ NaI + HI & ( NaBH ₄ ) & 2 BH ₃+2 NaI + H ₂ aligned